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Vibrational spectroscopy on solution-dispersed MoS2 for inkjet-printed photodetectors

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Abstract

Two-dimensional (2D) layered materials have shown promise for a wide range of semiconducting devices formed not only on rigid Si substrates, but also on low-cost, flexible substrates. Here, we present the temperature-dependent (~ 80 K to 573 K) frequency shifts of the Raman-active \({E}_{\text{2g}}^{1}\) and A1g modes of multilayer molybdenum disulfide (MoS2), which exhibited a red shift with increasing temperature. The full-width-at-half-maximum (FWHM) for the \({E}_{\text{2g}}^{1}\) and A1g modes was found to increase with temperature allowing us to compute a reduction in phonon lifetime for our liquid-exfoliated multilayer MoS2 due to the greater disorder. After these spectroscopic studies, the semiconducting dispersion of MoS2 was then integrated with graphene ink, to create an integrated inkjet-printed heterostructure photodetector onto flexible substrates. The photodetector was photo-responsive to broadband incoming radiation in the visible regime, where the photo-responsivity R ~ 0.11 A/W and conductivity σ ~ 5.9 × 10−2 S/m were achieved at room temperature. This high σ is due to the MoS2 flakes that provided a coherent film through additional rotary evaporator densification leading to less-trap density of the photo carrier. The detectivity D was calculated to be ~ 1.7 × 1010 Jones at a low light intensity of 3.2 mW/cm2, while the external quantum efficiency EQE was determined to be ~ 25% at wavelength λ ~ 550 nm. The linear dynamic range (LDR) indicates the high sensitivity and low-phase noise of a photodetector which was also calculated to be ~ 11 dB at room temperature, while the gain G was ~ 0.469 at 0.8 mW/cm2. With increasing intensity of the broadband incoming light source, the rise time and decay time of the photocurrent were measured for the first time for our inkjet-printed MoS2-graphene photodetector, setting the stage for future innovations in solution-processed 2D inorganic semiconductors.

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Funding

This work was supported by the Air Force Office of Scientific Research (grant number FA9550-15–1-0200) and the National Science Foundation (grant number NSF ECCS 1,753,933). A. B. K. received support from the PACCAR Technology Institute and Endowed Professorship.

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Authors and Affiliations

  1. Department of Electrical Engineering, PACCAR Technology Institute, University of North Texas, Denton, TX, 76207, USA

    Ridwan Fayaz Hossain, Avra S. Bandyopadhyay & Anupama B. Kaul

  2. Department of Materials Science and Engineering, PACCAR Technology Institute, University of North Texas, Denton, TX, 76207, USA

    Anupama B. Kaul

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  1. Ridwan Fayaz Hossain
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  2. Avra S. Bandyopadhyay
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  3. Anupama B. Kaul
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Correspondence to Anupama B. Kaul.

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Hossain, R., Bandyopadhyay, A. & Kaul, A. Vibrational spectroscopy on solution-dispersed MoS2 for inkjet-printed photodetectors. emergent mater. 5, 477–487 (2022). https://doi.org/10.1007/s42247-022-00383-x

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